in san francisco, ktvu channel 2 news. >> tragedy in connecticut touched people all over the country including here in the bay area. the flag at the federal building was lowered to honor the victims of the shooting. the flag at san francisco's federal building was lowered to half-staff. dozens of people gather for a rally outside of gun violences this afternoon. organizers urge president barack obama to use the terrible tragedy to push congress for stricter gun control laws. many those who attended happened to be in washington for a training session for gun violence prevention groups. our viewers are responding to the tragedy on our facebook page. one comment reads "my heart is so broken. i can not stop crying at the thought of what happened and how the families feel. all of the other student his to experience. it is such a devastating thing." visit ktvu channel 2 facebook page to leave your own condolences for the victims in the shooting by posting your comments on our wall. >>> today's events are hard to understand for just anyone. but what do you say about today's shooting to aa y